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Vitodens 100-W, B1HE/B1KE Combi Installation/Service
System Layout 3
Installation
Maximum Flow Rates
Vitodens 100-W, B1HE 85, 120, 150, 199 with
- DHW storage tank
- closely spaced tees
- one heating circuit
IMPORTANT
* Requires low loss header or closely spaced tees.
Model B1HE
85
120
150
199
Output MBH
80
113
141
187
t
30ºF (17ºC) rise GPM (L/h)
5.3 (1204)*
7.5 (1703)*
9.4 (2135)*
12.5 (2839)*
35ºF (19.5ºC) rise GPM (L/h)
4.6 (1045)
6.5 (1476)*
8.1 (1840)
10.7 (2430)*
40ºF (22ºC) rise GPM (L/h)
4.0 (908)
5.7 (1295)
7.1 (1613)
9.4 (2135)
DHW supply and return piping between boiler DHW
connections and the Viessmann DHW tank connections,
shall be a minimum of 1
a
in. nominal pipe diameter.
This ensures that the head of the pump is fully utilized
to overcome the resistance of the DHW heat exchanger
coil and to provide sufficient water flow to the boiler
heat exchanger.
In non-Viessmann DHW tank applications, perform, in
addition to the above, accurate calculations for DHW
tank coil pressure drop versus boiler pump head to ensure
sufficient water flow to the boiler heat exchanger.
Failure to heed the above instructions may cause boiler
short-cycling and inadequate DHW supply.
Note:
Refer to the residual head curves on page 32.
The use of a low-loss header is recommended if
the water flow rate is above or below the operating
range.
The low-loss header is available as accessory part.
Legend
PRV Pressure relief valve
TPV Temperature and pressure relief valve
A
Vitodens 100-W gas-fired condensing boiler
B
External boiler controller with room thermostat
connection (field supplied)
C
Heating
circuit
D
Heating circuit pump P2
E
DHW storage tank
F
DHW tank temperature sensor (or DHW temperature
switch)
G
Closely spaced tees, 4x pipe Ø or 12 in. (305 mm)
*1
H
Expansion
tank
I
Outdoor temperature sensor
*1
A low-loss header offers additional benefits not
provided by a pair of closely spaced tees.
Viessmann strongly recommends and prefers the
use of a low-loss header over closely spaced tees.
